DE3246225C2 - Broadband distribution system with a large number of channels - Google Patents
Broadband distribution system with a large number of channelsInfo
- Publication number
- DE3246225C2 DE3246225C2 DE19823246225 DE3246225A DE3246225C2 DE 3246225 C2 DE3246225 C2 DE 3246225C2 DE 19823246225 DE19823246225 DE 19823246225 DE 3246225 A DE3246225 A DE 3246225A DE 3246225 C2 DE3246225 C2 DE 3246225C2
- Authority
- DE
- Germany
- Prior art keywords
- frequency
- distribution system
- amplitude
- signals
- broadband
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Abstract
In einem Breitbandverteilsystem hoher Kanalzahl für Standard-TV-Bild- und Tonsignale sind Maßnahmen getroffen, um zusätzliche Bild- und Tonsignale ohne Erhöhung der Summenleistung der Verstärker eines Verteilnetzes zu übertragen. Die zusätzlichen Bild- und Tonsignale werden vor der Weitergabe an das Verteilnetz frequenzselektiv in der Amplitude abgesenkt und hinter den Übergabepunkten des Verteilnetzes entsprechend wieder angehoben.In a broadband distribution system with a large number of channels for standard TV picture and sound signals, measures are taken to transmit additional picture and sound signals without increasing the total power of the amplifiers in a distribution network. The amplitude of the additional video and audio signals is reduced in frequency-selective manner before being passed on to the distribution network and increased again accordingly after the transfer points of the distribution network.
Description
über Antennen einer Kopfslaiion eingespeist werden. Die Slandard-Fernsebsignale werden mittels Frequenzumselzern U11. Art in die übliche Zwischenfrequenzlage von 33.15 bis 40,15 MHz transponiert. Die UKW-Rundfunksignale werden entsprechend aufbereitet. Mittels Frequenzumsetzern U 2 2.ArI werden diese Zwisehenfrcquenzsignale in Kanäle eines Breitbandkommunikationsverteilnetzes BKVN von beispielsweise 47 bis 440 MHz umgesetzt.be fed in via antennas of a head laiion. The Slandard television signals are transposed into the usual intermediate frequency position of 33.15 to 40.15 MHz by means of frequency converters U 11. Art. The VHF radio signals are processed accordingly. By means of frequency converters U 2 2.ArI, these two-frequency signals are converted into channels of a broadband communication distribution network BKVN of 47 to 440 MHz, for example.
Zusätzliche TV-Programme, die beispielsweise von lokalen Studios in Eigenproduktion hergestellt werden oder von Salcllitenempfangsstationen und/oder Prograrnmbanken in das Verteilnetz BKVN eingespeist werden sollen, werden den Eingängen 2 der Signalaufbereitungsebene SAE zugeführt Nach der Frequenz- i-s umsetzung mittels der Frequenzumsetzer U\ I. An in die Zwischenfrequenzlage erfolgt mit Hilfe der Einrichtungen zur frequenzselektiven Amplitudenabsenkung PE bei den Bildsignalen eine Amplitudenabsenkung des Bildträgers BT um beispielsweise 6 dB, wie dies in Fig.2 dargestellt ist. Nach dieser Trägerabsenkung werden die zusätzlichen Bild- und Tonsignuie mittels der Frequenzumsetzer U 2 2. Art in die Übertragungslage des Breitbandkommunikationsverteilnetzes BKVN auf z. B. 47 bis 440 MHz hochgemischt. Alle Bild- und Tonsignale werden vor der Weiterleitung an das Verteilnetz BK VN mittels eines Sammelfeldes SFzu einem frequenzmultiplexen Summensignal zusammengefaßt.Additional television programs that are produced for example by local studios in-house production or to be fed from Salcllitenempfangsstationen and / or Prograrnmbanken into the distribution BKVN are the inputs 2 of the signal conditioning level SAE fed After the frequency is implementation by the frequency converter U \ I. In the intermediate frequency position, the devices for frequency-selective amplitude lowering PE are used to lower the amplitude of the image carrier BT by 6 dB, for example, as shown in FIG. After this carrier lowering the additional image and Tonsignuie by means of the frequency converter 2. U 2 type in the transfer layer of the broadband distribution network BKVN be z. B. 47 to 440 MHz mixed up. Before being forwarded to the distribution network BK VN, all video and audio signals are combined into a frequency-multiplexed sum signal by means of a collective field SF.
An das Sammelfeld SF sind Breitbandkornmunikationsvcrbindungsleitungen VBL angeschlossen, die das frequemzmultiplexe Summensignal jeweils zu einer Breilbandkommunikationsverstärkcrsielle BK VrSi weiterleiten. Diese Vcrstärkerstelle BK VrSt weist in der dargestellten Fig. I vier Verstärkerausgänge auf zum Anschluß je eines Verteilnetzes BK VN. Ein solches Ver- !■> teilnetz ist in Fig. 1 detaillierter dargestellt. Für die A-Ebenc sind die Verstärker ABV vorgesehen. Ein geregelter Verstärker A V beispielsweise besitzt einen Abzweigausgang AZan den ein Verstärker BVder ß-Ebcnc angeschlossen ist. An Abzweigausgängen BZ der Verstärker der ß-Ebene schließen sich die Abzweiger CTder C-Ebene an, welche aktiv — wie in F \ g. 1 dargestellt — oder passiv ausgebildet sein können. Die Abzweiger CVder C-Ebenc führen das frequcnzmultiplexe Summensiflnal den Übergabepunktcn L/P zu, von denen in F i g. 1 nur einer dargestellt ist.Broadband communication connection lines VBL are connected to the collecting field SF and each forward the frequency-multiplexed sum signal to a broadband communication amplifier BK VrSi. In the illustrated FIG. I, this amplifier station BK VrSt has four amplifier outputs for each connection to a distribution network BK VN. Such a distribution network is shown in greater detail in FIG. The ABV amplifiers are provided for the A-Ebenc. A regulated amplifier AV, for example, has a branch output AZ to which an amplifier BVder ß-Ebcnc is connected. At branch outputs BZ of the amplifiers of the ß-level connect the branches CT of the C-level, which are active - as in F \ g. 1 shown - or can be passive. The branches CV of the C-level feed the frequency-multiplexed summation signal to the transfer points L / P, of which in FIG. 1 only one is shown.
Das Breitbandkommunikationsvericilnetz BKVN kann in Koaxialtechnik oder in Lichtwellcnlcitci^chnik aufgebaut sein. Für beide Ausbildungen bietet die frequcn/.sclcktivc Ampliludcnabscnkung hinsichtlich der w Aussteuerung der Verstärker Vorteile. So können beispielsweise über ein für 12 TV-Programmc konzipiertes Koaxialkabclvcrteilncl/^OTV- und 24 UKW-Programme bei gleichem Ssrcckcnbetricbspegel, gleichem Störabstand, gleichem Intcrmodulationsabstand und glci- y> eher Aussteucrungsfähigkcil der Verstärker übertragen werden, ohne daß Änderungen i,n Vcricilneiz vorgenommen werden müßten.The broadband communication network BKVN can be constructed using coaxial technology or light wave technology. For both trainings the frequency / frequency amplification reduction offers advantages with regard to the modulation of the amplifiers. For example, on a system designed for 12 TV Programmc Koaxialkabclvcrteilncl / ^ OTV- and 24 FM stations in the same Ssrcckcnbetricbspegel, the same signal to noise ratio, the same Intcrmodulationsabstand and glci- y> rather Aussteucrungsfähigkcil the amplifier is transmitted, i without changes Vcricilneiz n made would have to be.
Hinter den Übcrgybcpunktcn f./P wird das frequenzmtiltiplcxc Summcnsignul mittels eines Vcrtcilfcldcs VF on auf die einzelnen Teilnchmerlciiungcn TIx verteilt. In diesen Tcilnchmerlcitungen TIx befinden sich die Einrichtungen zur frcquenzselektiven Amplitudenwiederanhebung der zusätzlich übertragenen TV-Signale. Mittels zweier Mehrfach-Bandpässe ßPI und ßP2 erfolgt eine Trennung des frcqnen/.multiplcxen Summcnsignals in die Standard TV-Kanilc - Sigmilwcg SW1 -, beispielsweise in den VHF-Bereichcn /I und Fill (47 bis 68MH/. und 174 bis 230MHz) sowie in die UKW-Standard-Kundfunkkanäle und in die Sonderkanäle d?r zusätzlich übertragenen TV-Signale — Signalweg SW2 —. beispielsweise in den VHF-Bereicher. für die Sondcrkanälc Su und So mit Erweiterung (104 bis 174 MII/ und 230 bis 440 MHz). Damit für alle zusätzlichen TV-Signale nur eine Einrichtung zur frequenzselektiven Amplitudenwiederanhebung DE erforderlich ist, wird mittels eines frequenzvariablen Frequenzumsetzers SU, dem von einer Steuereinheit Sf ein teilnehmerindividuellcs Abstimmsignal zugeführt wird, eine Frequenzumsetzung eines gewünschten Programms in einen Standard-TV-Kanal vorgenommen. Zur Aussiebung dieses unabhängig vom gewählten Sonderkanal immer gleichen Standard-TV-Kanals schließt sich an den Frequenzumsetzer SU ein Kanalfilter KF an. Hinter dem Kanalfilter KF befindet sich die Einrichtung zur frequenzselekliven Amplitudenwiederanhebung DL· Der zuvor in der Amplitude abgesenkte Bildträger ß7"wird nun, wie F i g,. 2b zeigt, um beispielf > ..;ise 6 dB wiederangehoben. Mit der Koppeiweiche Wc 'irfolgt die Zusammenfassung der beiden Signalwege SW1 und SW2. Für den im Signalweg SW2 ausgewählten und zu einem Standardkanal aufbereiteten Sonderkanal wird ein Frequenzbereich gewählt, der von den übrigen Standardkanälen nicht belegt ist, beispielsweise der Standard-Kanal 2 (47 bis 54 MHz). Hinter der Koppelweiche WE können dann die Programme des Verteilnetzes mit üblichen Fernsehempfängern FE über den Antenneneingang empfangen werden.After the transfer points f./P, the frequency frequency signal sum signal is distributed to the individual subscribers TIx by means of a circuit VF on. The devices for the frequency-selective amplitude re-increase of the additionally transmitted TV signals are located in these communication lines TIx. By means of two multiple bandpass filters ßPI and ßP2, the frcqnen / .multiplcxen buzz signal is separated into the standard TV channels - Sigmilwcg SW 1 -, for example in the VHF rangecn / I and Fill (47 to 68MH /. And 174 to 230MHz) as well as in the VHF standard radio channels and in the special channels for additionally transmitted TV signals - signal path SW2 -. for example in the VHF range. for the special channels Su and So with expansion (104 to 174 MII / and 230 to 440 MHz). So that only one device for frequency-selective amplitude repetition DE is required for all additional TV signals, a frequency conversion of a desired program into a standard TV channel is carried out by means of a frequency-variable frequency converter SU, to which a participant-specific tuning signal is fed from a control unit Sf. To filter out this standard TV channel, which is always the same regardless of the selected special channel, the frequency converter SU is followed by a channel filter KF . After the channel filter KF is the means for frequenzselekliven amplitude re-raising DL · The previously lowered in the amplitude image carrier SS7 "is now as F shows ig ,. 2b to beispielf>..;. Again lifted ise 6 dB With the Koppeiweiche Wc 'irfolgt the combination of the two signal paths SW 1 and SW2. For the special channel selected in signal path SW2 and processed into a standard channel, a frequency range is selected that is not occupied by the other standard channels, for example standard channel 2 (47 to 54 MHz) the coupling switch WE can then receive the programs of the distribution network with conventional television receivers FE via the antenna input.
Die Steuerung des Frequenzumsetzers SU über eine Steuereinheit S/ kann, falls die Teilnehmereinheit bestehend aus BP1. ßP2, SU, KF, DE, JVEaIs Vorschaltgerät VC konzipiert ist, in vorteilhafter Weise folgendermaßen erfolgen:The control of the frequency converter SU via a control unit S / can, if the subscriber unit is designed consisting of BP 1. ßP2, SU, KF, DE, JVEaIs ballast VC , advantageously take place as follows:
Das handelsübliche Infraroi-Fernbediengerät FB des Fernsehempfängers Ffsendet ein Programmwahlsignal an die Steuereinheit Si. In der Steuereinheit St w";rd das Programmwahlsignal in eine Steuerspannung zur Frequenzabstimmung des Frequenzumsetzers SL/aufbereitct. Falls sich die Teilnehmcreinheit nicht im gleichen Raum wie der Fernsehempfänger FE befindet, sondern beispielsweise Bestandteil eines Haus- oder Wohnungsanschlußkastens ist, kann die Steuereinheit Si aus örtlich getrennten Baueinheiten bestehen, die z. B. über eine Stcucrleitung miteinander verbunden sind.The commercially available Infraroi remote control device FB of the television receiver Ff sends a program selection signal to the control unit Si. In the control unit St w "; rd the program selection signal is processed into a control voltage for frequency tuning of the frequency converter SL /. If the subscriber unit is not in the same room as the television receiver FE , but is part of a house or apartment connection box, for example, the control unit Si can switch off There are spatially separated structural units that are connected to one another, for example, via a connector line.
Die Tcilnehmereinheit ßPI. ßP2. SU, KF. DE WE. bzw. die Steuereinheit S/. kann auch zum Zwecke der Erfassung von gebührenpflichtigen Programmen ausgelcgi sein. Der Frequenzumsetzer SU oder die Einrichtung Dl: kann beispielsweise so ausgestattet sein, daß eine Aktivierung erst nach Eingabe eines Berechtigung ,signals oder nach Stan eines Gebührenzähler erfolgt. Fig. 3. für die die gleichen Bezugszeichen wie in Fig. 1 gellen, zcigi ein modifiziertes BreitbaRdvcrteiUystem. Im Unterschied zum Brcilbandvcrtcilsystem gemäß I" i g. 1 befinden sich die Einrichtungen zur frequcn/sclekiivcn Amplitudcnabsenkung PE, an einer Stelle in der Signalaufbercitungsebcnc SAE, wo die zusätzlich zu übertragenden Bildsignale in Videolage vorliegen. Den Eingängen 1 werden videofrequent; Standard-TV- oder niederfrequente Standaro-UKW-Tonsignale zugeführt. Mittels der Umsetzer U1 und U2 werden diese Signale in die Übertragungslage des Breitbandkommunikationsverteilnetzes BK VN gebracht. Bei den zusätzlichen TV-Programmen wird das videofrequentc Bildsigna! den Eingängen 2a zugeführt. Die vidcofrcqucntcn Signale werden frequenzselektiv gemäßThe subscriber unit ßPI. ßP2. SU, KF. DE WE. or the control unit S /. can also be used for the purpose of recording fee-based programs. The frequency converter SU or the device Dl: can for example be equipped in such a way that activation only takes place after entering an authorization, signal or after a charge counter has been entered. Fig. 3. For which the same reference numerals as in Fig. 1 apply, zcigi a modified wide-spread distribution system. In contrast to the Brcilbandvcrtcilsystem according to I "i g. 1, the devices for frequency / small amplitude reduction PE are located at a point in the Signalaufbercitungsebcnc SAE, where the additional image signals to be transmitted are in video position. The inputs 1 are video frequency; standard TV- or low-frequency standard VHF audio signals. By means of converters U 1 and U 2, these signals are brought into the transmission position of the broadband communication distribution network BK VN . In the case of additional TV programs, the video-frequency image signal is fed to inputs 2a. The video-frequency signals are frequency-selective according to
dem Ampliludcngang nach Fig.4 in Einrichtung PF. abgesenkt. Audioanteile des TV-Signals werden den Eingängen Ib zugeführt. Sie gelangen ohne Anipliiudenabsenkung auf die Modulatorsitifcn M 2, wo sie zusammen mit den aufbereiteten Videosignalen in clic· ί Übcrtragungslagc des Brcilbandkommunikalionsvcrtcilnclzcs BK VN gebracht werden. Über das Sainmclfcld 5/·'erfolgt wie bei dein Ausführuiigsbeispiel nach F ig. I eine frcqucnzmulliplexc Zusammenfassung aller Bild- und Tonsignale. Für die Verteilung kann ein Verteilnctz BKVA/wie in Fig. I verwendet werden. Hinter den Übergabepunkten ÜPerfolgt mittels des Verteilfeldes VFcine Verteilung auf die einzelnen Teilnehmerlcitungen TIx. In den Teilnchmcrlcitungen TIc wird das frequenzmultiplexe Summensignal mittels der Bandpäs- is se BPX und BP2 wieder in Standard-TV und Sondcrkriüäic tCironrü Die Fr/*n"pnv""''«<''ziini7 erfolgt wie beim Ausführungsbeispiel nach Fig. 1 mit einem frcquenzvariablen Frequenzumsetzer SU, der wie zuvor über ein Infrarot-Fcrnbediengcrät FB gesteuert werden 2:1 kann. Der Frequenzumsetzer SU wird durch eine Absiimmspannung so gesteuert, daß immer eine Frequenzumsetzung in den gleichen Standard-TV-Kanal erfolgt, egal welcher Sonderkanal mit dem Fernbcdicngerät FB ausgewühlt wurde. Ein Kanalfilter KF/Mr Aussicbung >i des Standard-TV-Kanals schließt sich an den Frequenzumsetzer SUan. Der nachgeschaltctc Demodulator DM bringt diesen Stand:ird-TV-Kanal in die Vidcolage von 0 bis 5,5 MHz. Das videofrequcntc TV-Signa! durchlauft nun die Einrichtung zur frcqucnzsclektivcn Amplituden- h> wiederanhebung DE. Das vidcofrcquentc Signal wird dort einer Aufbereitung unterzogen, die zum in F i g. 4 gezeigten Amplitudengang invcrs ist; d. h_ die unteren Frequenzen des Videobandes werden um bis zu 11 dB wiederangehoben. Das Videoband wird durch einen Vi- v> deoverstärker VSauf einen Pegel angehoben, der ausreichend ist. um das Videoband dem Videoeingang VE des Fernsehempfängers FEzuführen zu können. Die mittels des Bandpasses BP1 ausgefilterten Standard TV-Programme — Signalweg SWI — werden dem Antenneneingang HEdcs Fernsehempfängers FEzugcführt.the amplitude response according to FIG. 4 in device PF. lowered. Audio components of the TV signal are fed to the inputs Ib. They get to the modulator sides M 2 without any lowering of the angle, where they, together with the processed video signals, are brought into the transmission position of the broadband communication system BK VN . As in your detailed example according to Fig. I a frcqucnzmulliplexc summary of all video and audio signals. A distributor BK VA / as in FIG. 1 can be used for the distribution. After the transfer points ÜP, distribution to the individual subscriber lines TIx takes place by means of the distribution field VFcine. In the Teilnchmcrlcitungen TIC the frequency-multiplexed composite signal 1 / * n "PNV" "'''''' by means of Bandpäs- is se BPX and BP2 back to standard TV and Sondcrkriüäic tCironrü The Fr ziini7 as in the embodiment of FIG. With a variable-frequency frequency converter SU, which, as before, can be controlled 2: 1 via an infrared remote control unit FB . The frequency converter SU is controlled by a tuning voltage so that the frequency is always converted to the same standard TV channel, regardless of which special channel is used with the Fernbcdicngerät FB was selected. A channel filter KF / Mr Ausicbung> i of the standard TV channel connects to the frequency converter SU . The downstream demodulator DM brings this status: earth TV channel in the video position from 0 to 5.5 MHz The video frequency TV signal now passes through the device for frequency sensitive amplitude re-increase DE showed amplitude response is invcrs; d. h_ the lower frequencies of the video tape are raised again by up to 11 dB. The video tape is raised to a sufficient level by a video amplifier VS. in order to be able to feed the video tape to the video input VE of the television receiver FE. The standard TV programs filtered out by means of the bandpass filter BP 1 - signal path SWI - are fed to the antenna input HEdcs television receiver FE.
Bisher wurde davon ausgegangen, daß alle Tcilnehmerleitungen TIx an das Vcrtcilfcld VF nach Art eines Sternnetzes angeschlossen sind, jeder Teilnehmerleitung TIx war in diesem Falle eine Teilnchmcreinheii 4-> zugeordet. Diese Konzeption empfiehlt sich bei einer niedrigen Teilnehmeranschlußdichte. Sind pro Übergabepunkt fIP sehr viele Teilnehmer angeschlossen, so ist ein modifiziertes ^mpfangsscitigcs System, dargestellt in Fig. 5. kostengünstiger. wSo far it has been assumed that all subscriber lines TIx are connected to the Vcrtcilfcld VF in the manner of a star network, each subscriber line TIx was in this case a subscriber unit 4-> assigned. This concept is recommended for a low subscriber line density. If a very large number of subscribers are connected per transfer point f IP , a modified reception system, shown in FIG. 5, is more cost-effective. w
Bei dem System nach F i g. 5 erfolgt hinter einem Übergabepunkt UP mittels der Bandpässe BPi und BP2 eine Auftrennung in Standard-TV und Standard-UKW-Rundfunkkanäle — Signalweg SW1 — sowie in zusätzlich übertragene Sonderkanäle — Signalwcg v, SW2 —. Ein Verteiiteld VFG verteilt das frequcnzmultiplexe Summensignal der Sonderkanäle auf die Ausgänge V1, VZ ■ ■, Vn. An diese Ausgänge schließen sich jeweils Kanalumsetzer KUi, KU2, .., KUn an, die jeweils einen der Sonderkanäle auf ein gleiches Zwi- m> schenfrequenzband von beispielsweise 5 bis 12 MHz umsetzen. Mittels der Zwischenfrequenzfilter FZi, FZ2. ..-. FZn wird jeweils das Zwischenfrequenzband ausgefiltert. Anschließend wird mittels der Einrichtungen DE eine frequenzselektive Amplitudenwiederanhebung vorgenommen und zwar invers zur frequenzselektiven Amplitudenabsenkuiig in der Signalaufbereitungsebene SAE, vgl. beispielsweise Fig.2 oder Fig.4.In the system according to FIG. 5, after a transfer point UP, the bandpass filters BPi and BP2 are used to separate standard TV and standard VHF radio channels - signal path SW 1 - and additionally transmitted special channels - Signalwcg v, SW2 -. A distribution field VFG distributes the frequency-multiplex sum signal of the special channels to the outputs V 1, VZ ■ ■ , Vn. These outputs are connected to channel converters KUi, KU2, .., KUn , each of which has one of the special channels on the same space converting the frequency band of, for example, 5 to 12 MHz. By means of the intermediate frequency filters FZi, FZ 2. ..-. FZn the intermediate frequency band is filtered out in each case. A frequency-selective amplitude re-increase is then carried out by means of the devices DE, namely inversely to the frequency-selective amplitude decrease in the signal processing level SAE, see, for example, FIG. 2 or FIG.
Durch weitere Kanalumsetzer KS I. KS2 KSn erfolgt eine Frequenzumsetzung jedes Zwischctifrcqucn/-bandes in jeweils einen nicht belegten Slandaid-TV-Ka-By means of further channel converters KS I. KS2 KSn , a frequency conversion of each intermediate frequency / band takes place in an unoccupied Slandaid TV channel.
nal. Kanalfilter Kl-'I. Kl'2 KFn befreien die innal. Channel filter Kl-'I. Kl'2 KFn free the in
Siandard-TV-Kanalc umgesetzten Soiulerkaniilc von Mischprodiikten. Kin Samniclfcld VG' faßt die so aus den Sonderkaiiiilen gewonnenen StaiuUirdkanälc zu einem Frequen/.imiliiplexsignal zusammen. Über eine Weiche Wl: werden die Signale der Signalwcge .S-W I und .S'W2 wieder zusammengefaßt. An die Weiche Wl: schließt sich nun das Daumnet/. BN für mehrere Teilnehmer TN an. Da die Sonderkanälc bei dem System genial) F i g. 5 in Standard-Kanäle aufbereitet sind, sind für die Teilnehmer TN keine scpanHcn Tcilnehmercinrichiurtgen wie in den F i g. I und 3 notwendig.Standard TV channels implemented by mixed products. Kin Samniclfcld VG 'combines the common channels thus obtained from the special quarries into a frequency similiplex signal. The signals of the signal paths .S - WI and .S'W2 are combined again via a switch Wl: At the switch Wl: the Daumnet / now closes. BN for several participants TN . Since the special channels in the system are ingenious) F i g. Are prepared in standard channels 5, no scpanHcn Tcilnehmercinrichiurtgen as shown in F i g are for the subscriber TN. I and 3 necessary.
In F i g. 6 ist ein Konzept dargestellt, bei dem die Einrichtungen zur frcqucnzsclektiven Aniplitudenwicderanhcbung in die Teilnehmergcrätc integriert sind. Es wird von einem handelsüblichen Fcrnsch-Teilnehmergerät TC ausgegangen. Die Baugruppen Fernschtuner FT, Videodemodulator VD, RGB-Verstärker V und Bildröhre BK sind Bestandteil des Teilnehmergerätes 7Ti. Die Baugruppen Bandpässe BP I und BP2. Sondcrkanalumselzer SlJ. Sondcrkanaldcmodulator SD, Einrichtung zur frcquenzselektiven Ampliludenabscnkung DE und I Imschalter S I müssen nachgeröstet sein. Die Teilnehmerleitung TIx jenseits des Übergabepunktes /.//'wird mit dem Antcnncneingang AEdesTcilnchmcrgcrätcs TC> verbunden. Beim Empfang von TV-Standardkanälen wird der Schalter Sbcispielswcisc über das Fernbediengerät FB in Stellung 1 gebracht. Beim Empfang von TV-Sonderkanälen werden diese durch den Bandpaß BP2 aus dem Frequenzmultiplexsignal hcrausgefiltert. Mittels einem durch das Fernbediengerät FB steuerbaren Sonderkanalumsetzer SU wird der gewünschte Sonderkanai in die Zwiscncnifequenzlagc des Tc'!nchmcrgerälcs TG gebracht. Nach einer Kanalfilterung erfolgt eine Demodulation des Sonderkanals durch den Demodulator .9D. Das demodulierte videofrcquente Signal wird mittels DE frequenzselektiv in der Amplitude wiederangehoben gemäß eines zu Fig.4 inversen Amplitudengangs. Über den mit dem Fernbcdicngerät FB in Schalterstellung 2 gesteuerten Schaller S gelangt das Signal eines aufbereiteten Sondcrkanals auf den RGB-Verstärker V.In Fig. 6 shows a concept in which the devices for the selective increase in amplitude are integrated in the subscriber devices. A commercially available Fcrnsch subscriber unit TC is assumed. The modules Fernschtuner FT, video demodulator VD, RGB amplifier V and picture tube BK are part of the subscriber device 7Ti. The assemblies bandpass filters BP I and BP2. Sondcrkanalumselzer SlJ. Special channel modulator SD, device for frequency-selective amplitude reduction DE and I switch S I must be roasted. The subscriber line TIx beyond the transfer point /.// 'is connected to the antenna input AEdesTcilnchmcrgcrätcs TC> . When receiving standard TV channels, the switch Sbcbeispielswcisc is set to position 1 via the remote control unit FB. When receiving special TV channels, these are filtered out of the frequency division multiplexed signal by the bandpass filter BP2. By means of a special channel converter SU controllable by the remote control device FB , the desired special channel is brought into the intermediate sequence position of the Tc '! Nchmcrgerälcs TG . After channel filtering, the special channel is demodulated by the demodulator .9D. The demodulated video-frequency signal is frequency-selectively increased in amplitude by means of DE in accordance with an amplitude response that is inverse to FIG. Via the Schaller S, which is controlled with the remote control unit FB in switch position 2, the signal from a processed special channel is sent to the RGB amplifier V.
Falls die frcqucnzsclcktivc Amplitudenabscnkung in der Signalaufbcrcitiingsebene SAE. im Gegensalz /um Ausführungsbcispiel nach F i g. 6, in Zwischenfrequenzlage (33.15 — 40,15 MHz) vorgenommen wird, beendet sich die Einrichtung zur Amplitudenwiederanhebung DE zwischen dem Sonderkanalumsclzer SU und der Vidcodcmodulalionsstufc VD und nimmt eine Amplitudenwiederanhebung gemäß Fig. 2b vor. Ein solches Ausführungsbeispiel zeigt Fig. 7. Der Schalter S, der die Umschaltung zwischen Standard- TV- und Sonderkanälen vornimmt, befindet sich nun vor der Videodemodulationsstufe VD.If the frequency reduction amplitude decrease in the signal processing level SAE. in contrast to the exemplary embodiment according to FIG. 6, is carried out in the intermediate frequency position (33.15 - 40.15 MHz), the device for amplitude re-increase DE between the special channel converter SU and the Vidcodcmodulalionsstufc VD ends and performs an amplitude re-increase according to FIG. 2b. Such an exemplary embodiment is shown in FIG. 7. The switch S, which switches between standard TV and special channels, is now located in front of the video demodulation stage VD.
Wenn der Fernsehtuner FT des Teilnehmergeräies TG für den gesamten Frequenzbereich des Breitbandverteilsystems konzipiert ist — also für den Bereich von 47 bis 440 MHz —, solche TV-Empfangsgeräte sind bereits handelsüblich, so muß nur die Einrichtung zur frequenzsclckliven Amplitudenwiederanhebung DEin der Zwischenfrequenzlage, wie F i g. 8 zeigt, oder in der Videolagc, wie F i g. 8 gestrichelt zeigt, nachgerüstet werden. Spezielle Umsetzungen von Sonderkanälen in Standardkanäle hinter den Übergabepunkten UP können entfallen.If the television tuner FT of the subscriber unit TG is designed for the entire frequency range of the broadband distribution system - i.e. for the range from 47 to 440 MHz - such TV receivers are already commercially available, then only the device for frequency-sensitive amplitude re-increase in the intermediate frequency position, such as F i G. 8 shows, or in the videolagc, as FIG. 8 shows in dashed lines, can be retrofitted. Special conversions of special channels in standard channels behind the transfer points UP can be omitted.
I licr/.u 6 Blatt ZeichnungenI licr / .u 6 sheets of drawings
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE19823246225 DE3246225C2 (en) | 1982-12-14 | 1982-12-14 | Broadband distribution system with a large number of channels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE19823246225 DE3246225C2 (en) | 1982-12-14 | 1982-12-14 | Broadband distribution system with a large number of channels |
Publications (2)
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DE3246225A1 DE3246225A1 (en) | 1984-06-14 |
DE3246225C2 true DE3246225C2 (en) | 1985-07-18 |
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DE19823246225 Expired DE3246225C2 (en) | 1982-12-14 | 1982-12-14 | Broadband distribution system with a large number of channels |
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